64133320631 has 4 divisors (see below), whose sum is σ = 64139027064. Its totient is φ = 64127614200.

The previous prime is 64133320597. The next prime is 64133320649. The reversal of 64133320631 is 13602333146.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64133320631 - 2⁶ = 64133320567 is a prime.

It is a super-2 number, since 2×64133320631² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64133320661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2836325 + ... + 2858846.

It is an arithmetic number, because the mean of its divisors is an integer number (16034756766).

Almost surely, 2^64133320631 is an apocalyptic number.

64133320631 is a deficient number, since it is larger than the sum of its proper divisors (5706433).

64133320631 is a wasteful number, since it uses less digits than its factorization.

64133320631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5706432.

The product of its (nonzero) digits is 23328, while the sum is 32.

Adding to 64133320631 its reverse (13602333146), we get a palindrome (77735653777).

The spelling of 64133320631 in words is "sixty-four billion, one hundred thirty-three million, three hundred twenty thousand, six hundred thirty-one".